Kids/teens are great at rebellion although I wouldn't know cuz I haven't gone through that phase yet.........but I'm still hopeful! As an adult I recall a period when I wouldn't say no to people so I was beginning to take a stand. I was at a party and my friend brought her brother along. We were having a great time but she had to leave and asked if I would bring her brother home so he could stay longer. Well I was in assertive mode so I said that I wouldn't be able to and she looked at me like what was the big deal since I wasn't going too far out of my way. I was so hooked on taking a stand that I wasn't considering that perhaps that wasn't the occasion to take a stand on since I was enjoying his company. Another time some guy at work that I hardly knew asked me to drive him somewhere after work. I really didn't know how far away that town was. One of my co-workers told me how far it was and that he should have told me that to begin with. She suggested that I just tell him I couldn't. (Plus, he was a little bit skanky but I was trying to be nice.) I called him and told him I couldn't and he said "now what am I supposed to do?" Again, not sure if that was the time to assert my new found "no" word. I was saying no to EVERYONE who I wanted to in the past. For me this was being more rebellious than assertive because I was rebelling against my "good girl" image where people couldn't imagine me not being "nice." Currently my biggest rebellious moves are not wiping the shower down before getting out (I just want to attend to business and leave) - of course I will suffer because mold and mildew grow quickly. I may not do the dishes for a couple of days - and someone will stop by unexpectedly. I won't do housework for awhile because I'm sick and tired of it - then I get sick and tired at breathing in all the accumulated dust and get exhausted by trying to find things buried in piles. So how can you rebel as an adult and not have the consequences come back to bite you in the *ss???? There's got to be a way. 
Bam
Bam


